一、javascrit放在哪些文件中
1、放在<script>标签中
(1)直接放
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title></title>
</head>
<body>
<script type="text/javascript">
document.write("初学javascript")
document.write("<h1>hello javascript</h1>")
</script>
</body>
</html>
代码运行结果是
(2)再把<script>标签放在<div>标签中
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title></title>
</head>
<body>
<div>
<script type="text/javascript">
document.write("初学javascript")
document.write("<h1>hello javascript</h1>")
</script>
</div>
</body>
</html>
代码运行结果是一样
2、放外部文件中
export.js文件的代码:
/**
* Created by pere on 2019-10-04.
*/
document.write("初学javascript")
document.write("<h1>hello javascript</h1>")
test1中的代码:
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title></title>
<script type="text/javascript" src="export.js"></script>
</head>
<body>
</body>
</html>
运行结果是
3、放在HTML标签中
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title></title>
</head>
<body>
<input type="button" value="弹出消息" onclick="javascript:alert('欢迎你')">
</body>
</html>
代码运行结果:onlcick事件
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title></title>
<!--<script type="text/javascript" src="export.js"></script>-->
</head>
<body>
<a onclick="javascript:alert('欢迎你')" href="javascript:alert('a标签弹出')">a标签</a>
</body>
</html>
运行代码的结果
点击a标签后弹出
点击确定后弹出